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* [RFC v5 0/8] PCI: hv: Support host bridge probing on ARM64
@ 2021-07-20 13:44 Boqun Feng
  2021-07-20 13:44 ` [RFC v5 1/8] PCI: Introduce domain_nr in pci_host_bridge Boqun Feng
                   ` (7 more replies)
  0 siblings, 8 replies; 14+ messages in thread
From: Boqun Feng @ 2021-07-20 13:44 UTC (permalink / raw)
  To: Bjorn Helgaas, Arnd Bergmann, Marc Zyngier
  Cc: Catalin Marinas, Will Deacon, K. Y. Srinivasan, Haiyang Zhang,
	Stephen Hemminger, Wei Liu, Dexuan Cui, Lorenzo Pieralisi,
	Rob Herring, Krzysztof Wilczyński, Boqun Feng,
	linux-arm-kernel, linux-kernel, linux-hyperv, linux-pci,
	Sunil Muthuswamy, Mike Rapoport

Hi Bjorn, Arnd and Marc,

This is the v5 for the preparation of virtual PCI support on Hyper-V
ARM64, Previous versions:

v1:	https://lore.kernel.org/lkml/20210319161956.2838291-1-boqun.feng@gmail.com/
v2:	https://lore.kernel.org/lkml/20210503144635.2297386-1-boqun.feng@gmail.com/
v3:	https://lore.kernel.org/lkml/20210609163211.3467449-1-boqun.feng@gmail.com/
v4:	https://lore.kernel.org/lkml/20210714102737.198432-1-boqun.feng@gmail.com/

Changes since last version:

*	Rebase to 5.14-rc2

*	Wording changes (Capitalization and more explanation on why) as
	suggested by Bjorn.

*	Split the patch #3 in previous into two patches as suggested by
	Bjorn.

The basic problem we need to resolve is that ARM64 is an arch with
PCI_DOMAINS_GENERIC=y, so the bus sysdata is pci_config_window. However,
Hyper-V PCI provides a paravirtualized PCI interface, so there is no
actual pci_config_window for a PCI host bridge, so no information can be
retrieve from the pci_config_window of a Hyper-V virtual PCI bus. Also
there is no corresponding ACPI device for the Hyper-V PCI root bridge,
which introduces a special case when trying to find the ACPI device from
the sysdata (see patch #3).

With this patchset, we could enable the virtual PCI on Hyper-V ARM64
guest with other code under development.

Comments and suggestions are welcome.

Regards,
Boqun

Arnd Bergmann (1):
  PCI: hv: Generify PCI probing

Boqun Feng (7):
  PCI: Introduce domain_nr in pci_host_bridge
  PCI: Support populating MSI domains of root buses via bridges
  arm64: PCI: Restructure pcibios_root_bridge_prepare()
  arm64: PCI: Support root bridge preparation for Hyper-V
  PCI: hv: Set ->domain_nr of pci_host_bridge at probing time
  PCI: hv: Set up MSI domain at bridge probing time
  PCI: hv: Turn on the host bridge probing on ARM64

 arch/arm64/kernel/pci.c             | 29 +++++++---
 drivers/pci/controller/pci-hyperv.c | 86 +++++++++++++++++------------
 drivers/pci/probe.c                 | 12 +++-
 include/linux/pci.h                 | 10 ++++
 4 files changed, 92 insertions(+), 45 deletions(-)

-- 
2.30.2


^ permalink raw reply	[flat|nested] 14+ messages in thread

end of thread, other threads:[~2021-07-21  0:59 UTC | newest]

Thread overview: 14+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-07-20 13:44 [RFC v5 0/8] PCI: hv: Support host bridge probing on ARM64 Boqun Feng
2021-07-20 13:44 ` [RFC v5 1/8] PCI: Introduce domain_nr in pci_host_bridge Boqun Feng
2021-07-20 22:49   ` Bjorn Helgaas
2021-07-21  0:57     ` Boqun Feng
2021-07-20 13:44 ` [RFC v5 2/8] PCI: Support populating MSI domains of root buses via bridges Boqun Feng
2021-07-20 13:44 ` [RFC v5 3/8] arm64: PCI: Restructure pcibios_root_bridge_prepare() Boqun Feng
2021-07-20 13:44 ` [RFC v5 4/8] arm64: PCI: Support root bridge preparation for Hyper-V Boqun Feng
2021-07-20 13:44 ` [RFC v5 5/8] PCI: hv: Generify PCI probing Boqun Feng
2021-07-20 13:44 ` [RFC v5 6/8] PCI: hv: Set ->domain_nr of pci_host_bridge at probing time Boqun Feng
2021-07-20 13:44 ` [RFC v5 7/8] PCI: hv: Set up MSI domain at bridge " Boqun Feng
2021-07-20 13:44 ` [RFC v5 8/8] PCI: hv: Turn on the host bridge probing on ARM64 Boqun Feng
2021-07-20 14:38   ` Marc Zyngier
2021-07-20 14:59     ` Boqun Feng
2021-07-20 15:53       ` Marc Zyngier

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